EP3255189A1 - Schmelzgeblasenes gewebe mit guten wasserbarriereeigenschaften - Google Patents

Schmelzgeblasenes gewebe mit guten wasserbarriereeigenschaften Download PDF

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Publication number
EP3255189A1
EP3255189A1 EP16173184.9A EP16173184A EP3255189A1 EP 3255189 A1 EP3255189 A1 EP 3255189A1 EP 16173184 A EP16173184 A EP 16173184A EP 3255189 A1 EP3255189 A1 EP 3255189A1
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EP
European Patent Office
Prior art keywords
polypropylene
range
melt
mbf
molecular weight
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP16173184.9A
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English (en)
French (fr)
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EP3255189B1 (de
Inventor
Jingbo Wang
Petar Doshev
Antti Tynys
Joachim Fiebig
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Borealis AG
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Borealis AG
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Filing date
Publication date
Priority to DK16173184.9T priority Critical patent/DK3255189T3/en
Application filed by Borealis AG filed Critical Borealis AG
Priority to EP16173184.9A priority patent/EP3255189B1/de
Priority to PCT/EP2017/063434 priority patent/WO2017211709A1/en
Priority to CN201780032127.3A priority patent/CN109312511B/zh
Priority to BR112018071865-3A priority patent/BR112018071865B1/pt
Priority to US16/302,071 priority patent/US20190301054A1/en
Publication of EP3255189A1 publication Critical patent/EP3255189A1/de
Application granted granted Critical
Publication of EP3255189B1 publication Critical patent/EP3255189B1/de
Priority to SA518400448A priority patent/SA518400448B1/ar
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    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
    • D01F6/44—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds as major constituent with other polymers or low-molecular-weight compounds
    • D01F6/46—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds as major constituent with other polymers or low-molecular-weight compounds of polyolefins
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/10—Homopolymers or copolymers of propene
    • C08L23/14—Copolymers of propene
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
    • D01D5/00—Formation of filaments, threads, or the like
    • D01D5/08—Melt spinning methods
    • D01D5/098—Melt spinning methods with simultaneous stretching
    • D01D5/0985—Melt spinning methods with simultaneous stretching by means of a flowing gas (e.g. melt-blowing)
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
    • D01F6/02—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D01F6/04—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolymers obtained by reactions only involving carbon-to-carbon unsaturated bonds from polyolefins
    • D01F6/06—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolymers obtained by reactions only involving carbon-to-carbon unsaturated bonds from polyolefins from polypropylene
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
    • D01F6/28—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from copolymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D01F6/30—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from copolymers obtained by reactions only involving carbon-to-carbon unsaturated bonds comprising olefins as the major constituent
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
    • D04H1/4282—Addition polymers
    • D04H1/4291—Olefin series
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/54—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by welding together the fibres, e.g. by partially melting or dissolving
    • D04H1/542—Adhesive fibres
    • D04H1/544—Olefin series
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/54—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by welding together the fibres, e.g. by partially melting or dissolving
    • D04H1/56—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by welding together the fibres, e.g. by partially melting or dissolving in association with fibre formation, e.g. immediately following extrusion of staple fibres
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
    • D04H3/005—Synthetic yarns or filaments
    • D04H3/007—Addition polymers
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
    • D04H3/08—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating
    • D04H3/16—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating with bonds between thermoplastic filaments produced in association with filament formation, e.g. immediately following extrusion
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2203/00—Applications
    • C08L2203/12—Applications used for fibers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
    • C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2505/00—Industrial
    • D10B2505/04—Filters
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2509/00—Medical; Hygiene
    • D10B2509/02—Bandages, dressings or absorbent pads
    • D10B2509/026—Absorbent pads; Tampons; Laundry; Towels

Definitions

  • the present invention is directed to a melt blown fiber comprising a polypropylene composition; said composition comprises two polypropylenes which differ in the melt flow rate MFR 2 .
  • the invention is further directed to a melt-blown web comprising said fiber.
  • the non-woven polypropylene webs are widely used as barrier layers in the hygiene field and filtration media industry.
  • One of the main requirements of the barrier layers is the barrier property, measured as the hydrohead of the web.
  • a high hydrohead is welcome, meaning better barrier properties at similar web weight, or reduced web weight but similar barrier properties can be achieved. This means in turn reduced consumption of materials thereby reducing costs and CO 2 footprint. Further the air permeability should be rather low.
  • polypropylenes obtained in the presence of Ziegler-Natta catalysts are widely used.
  • the thus obtained polymers are visbroken which, however, generates the problem of unfavourable odour.
  • Another disadvantage is the production of oligomers which might lead to difficulties in the hygiene field. Further, the formation of shots during the production of the web drastically reduces the barrier properties.
  • the object of the present invention is to provide a material which is suitable for producing a melt blown web with high hydrohead and low air permeability.
  • the finding of the present invention is to provide a melt blown fiber based a polypropylene composition which comprises two polypropylenes which differ in their molecular weight and thus also in the melt flow rate.
  • the present invention is directed to a melt blown fiber (MBF) comprising a polypropylene composition (PC) comprising
  • the first polypropylene (PP1) has a weight average molecular weight Mw in the range of 35 to 75 kg/mol and/or a melt flow rate MFR 2 (230 °C) measured according to ISO 1133 of at least 1,000 g/10min.
  • the mixture (M) has a weight average molecular weight Mw in the range of 50 to 110 kg/mol.
  • the polypropylene composition (PC) has
  • the amount of the first polypropylene (PP1) and the second polypropylene (PP2) and/or the amount of the mixture (M) together makes up at least 80 wt.-% of the polypropylene composition (PC); and/or the amount of the first polypropylene (PP1) and the second polypropylene (PP2) together makes up at least 80 wt.-% of the melt blow fiber (MBF).
  • PC polypropylene composition
  • MVF melt blow fiber
  • the amount of the polypropylene composition (PC) makes up at least 80 wt.-% of the melt blow fiber (MBF).
  • the weight ratio between the first polypropylene (PP1) and the second polypropylene (PP2) [wt.-% (PP1)/wt.-% (PP2)] is in the range of 0.05 to 1.90.
  • the ratio of the weight average molecular weight Mw of the mixture (M) to the weight average molecular weight Mw of the first polypropylene (PP1) [Mw(M)/Mw(PP1)] is in the range of 0.7 to 3.1 and/or the ratio of the melt flow rate MFR 2 of the mixture (M) to the melt flow rate MFR 2 of the first polypropylene (PP1) [MFR 2 (M)/MFR 2 (PP1)] is in the range of 0.08 to 1.00.
  • the mixture (M) and/or the polypropylene composition (PC) has/have
  • the mixture (M) and/or the polypropylene composition (PC) has/have
  • the polypropylene composition has a xylene cold soluble (XCS) fraction in the range of 1.0 to 10.0 wt.-%
  • the weight average molecular weight Mw of the second polypropylene (PP2) is higher than the weight average molecular weight Mw of the first polypropylene (PP1), preferably the weight average molecular weight Mw of the second polypropylene (PP2) is in the range of 90 to 215 kg/mol.
  • the second polypropylene (PP2) has a melt flow rate MFR 2 (230 °C) measured according to ISO 1133 in the range of 50 to 650 g/10 min and/or a comonomer content of more than 2.0 to 8.0 wt-%.
  • the first polypropylene (PP1) has
  • the fibers have an average diameter of 0.3 to 5.0 ⁇ m
  • melt-blown web comprising melt blow fibers (MBF) as defined above and in more detail below.
  • melt-blown web has a weight per unit area of at most 120 g/m 2 .
  • the invention is directed to an article comprising a melt-blown web (MBW) as defined above and in more detail below wherein article is selected from the group consisting of filtration medium, diaper, sanitary napkin, panty liner, incontinence product for adults, protective clothing, surgical drape, surgical gown, and surgical wear.
  • MGW melt-blown web
  • the melt blown fiber (MBF) The melt blown fiber (MBF)
  • the melt blown fiber (MBF) must comprise a polypropylene composition (PC) wherein said polypropylene composition (PC) comprises a first polypropylene (PP1) and a second polypropylene (PP2).
  • PC polypropylene composition
  • PP1 first polypropylene
  • PP2 polypropylene
  • the definition of the melt blown fiber (MBF) is also applicable to the sum of melt blown fibers (MBFs) which are produced with the same material comprising the polypropylene composition (PC), preferably which are produced with the same polypropylene composition (PC).
  • the main component of the melt blown fiber is the polypropylene composition (PC). Accordingly, it is preferred that the melt blown fiber (MBF) contains at least 80 wt.-%, more preferably at least 90 wt.-%, still more preferably 95 wt.-% of the polypropylene composition (PC). Thus in one preferred embodiment the melt blown fiber (MBF) consists of the polypropylene composition (PC).
  • the melt blown fiber (MBF) comprises at least 80 wt.-%, more preferably at least 85 wt.-%, yet more preferably at least 90 wt.-%, like at least 95 wt.-%, of the mixture (M), i.e. of the first polypropylene (PP1) and the second polypropylene (PP2) together, based on the total weight of the melt blown fiber (MBF).
  • the melt blown fiber consists of the polypropylene composition (PC), wherein further preferably the polypropylene composition (PC) consists of the mixture (M), i.e. the mixture of the first polypropylene (PP1) and the second polypropylene (PP2), and additives (AD), wherein more preferably the amount of the mixture (M), i.e. of the mixture of the first polypropylene (PP1) and the second polypropylene (PP2), is at least 85 wt.-%, yet more preferably at least 90 wt.-%, like at least 95 wt.-%, based on the total weight of the polypropylene composition (PC).
  • PC polypropylene composition
  • PC polypropylene composition
  • AD additives
  • melt blown fibers (MBFs) preferably have an average diameter (average filament fineness) in the range of 0.3 to 5.0 ⁇ m, more preferably in the range of 0.5 to 4.5 ⁇ m, yet more preferably in the range of 0.5 to 4.0 ⁇ m.
  • the polypropylene composition (PC) comprises a first polypropylene (PP1) and a second polypropylene (PP2). It is preferred that the first polypropylene (PP1) and the second polypropylene (PP2) together make up the main part of the polypropylene composition (PC).
  • the mixture (M) is regarded as a mixture consisting of the first polypropylene (PP1) and the second polypropylene (PP2). Accordingly, in one preferred embodiment the first polypropylene (PP1) and the second polypropylene (PP2) are the only polypropylenes, more preferably the only polymers in the polypropylene composition (PC).
  • the polypropylene composition (PC) comprises at least 80 wt.-%, more preferably at least 85 wt.-%, yet more preferably at least 90 wt.-%, like at least 95 wt.-%, of the mixture (M), i.e. of the first polypropylene (PP1) and the second polypropylene (PP2) together, based on the total weight of the polypropylene composition (PC).
  • the remaining part of the polypropylene composition (PC) is typical additives (AD).
  • the polypropylene composition (PC) consists of the mixture (M), i.e.
  • PC polypropylene composition
  • the polypropylene composition (PC) comprises the first polypropylene (PP1) and the second polypropylene (PP2). It is preferred that the weight ratio between the first polypropylene (PP1) and the second polypropylene (PP2) [wt.-% (PP1)/wt.-% (PP2)] is in the range of 0.05 to 1.90, more preferably in the range of 0.10 to 1.50, yet more preferably in the range of 0.18 to 1.22.
  • the mixture (M) i.e. the mixture of the first polypropylene (PP1) and the second polypropylene (PP2), has a melt flow rate MFR 2 (230 °C) measured according to ISO 1133 of at least 650 g/10min, more preferably in the range of 750 to 3000 g/10min, still more preferably in the range of 850 to 2500 g/10min, like in the range of 950 to 2000 g/10min.
  • the mixture (M) i.e. the mixture of the first polypropylene (PP1) and the second polypropylene (PP2), has a weight average molecular weight Mw in the range of 50 to 110 kg/mol, more preferably in the range of 55 to 100 kg/mol, like in the range of 60 to 95 kg/mol.
  • the mixture (M) i.e. the mixture of the first polypropylene (PP1) and the second polypropylene (PP2), has a molecular weight distribution (Mw/Mn) in the range of 2.0 to 10.0, more preferably in the range of 2.5 to 9.0, like in the range of 2.9 to 8.5.
  • the information provided for the mixture (M) with regard to the melt flow rate MFR 2 , the weight average molecular weight Mw as well as to the molecular weight distribution (Mw/Mn) is also applicable for the polypropylene composition (PC). This holds in particular true in case the polypropylene composition (PC) consists of the mixture (M) and optional additives (AD).
  • the polypropylene composition (PC) has a melt flow rate MFR 2 (230 °C) measured according to ISO 1133 of at least 750 g/10min, more preferably in the range of 850 to 3000 g/10min, still more preferably in the range of 950 to 2500 g/10min, like in the range of 970 to 2000 g/10min and/or a weight average molecular weight Mw in the range of 50 to 110 kg/mol, more preferably in the range of 55 to 100 kg/mol, like in the range of 60 to 95 kg/mol, and/or a molecular weight distribution (Mw/Mn) in the range of 2.0 to 10.0, more preferably in the range of 2.5 to 9.0, like in the range of 2.9 to 8.5.
  • MFR 2 230 °C measured according to ISO 1133 of at least 750 g/10min, more preferably in the range of 850 to 3000 g/10min, still more preferably in the range of 950 to 2500 g/10min, like in the range of 9
  • the ratio of the weight average molecular weight Mw of the mixture (M) to the weight average molecular weight Mw of the first polypropylene (PP1) [Mw(M)/Mw(PP1)] is in the range of 0.7 to 3.1, more preferably in the range 0.9 to 2.5, yet more preferably in the range of 1.0 to 2.2.
  • the weight average molecular weight Mw of the polypropylene composition (PC) to the weight average molecular weight Mw of the first polypropylene (PP1) [Mw(PC)/Mw(PP1)] is in the range of 0.7 to 3.1, more preferably in the range 0.9 to 2.5, yet more preferably in the range of 1.0 to 2.2.
  • the ratio of the weight average molecular weight Mw of the second polypropylene (PP2) to the weight average molecular weight Mw of the mixture (M) [Mw(PP2)/Mw(M)] is in the range of 1.2 to 3.2, more preferably in the range of 1.5 to 2.7, yet more preferably in the range of 1.7 to 2.5.
  • the ratio of the weight average molecular weight Mw of the second polypropylene (PP2) to the weight average molecular weight Mw of the polypropylene composition (PC) [Mw(PP2)/Mw(PC)] is in the range of more than 1.2 to 3.2, more preferably in the range 1.5 to 2.7, yet more preferably in the range of 1.7 to 2.5.
  • the ratio of the melt flow rate MFR 2 measured according to ISO 1133 of the mixture (M) to the melt flow rate MFR 2 (230 °C) measured according to ISO 1133 of the first polypropylene (PP1) [MFR 2 (M)/MFR 2 (PP1)] is in the range of 0.08 to 0.62, more preferably in the range of 0.10 to 0.50, yet more preferably in the range of 0.15 to 0.35.
  • the ratio of the melt flow rate MFR 2 of the polypropylene composition (PC) to the melt flow rate MFR 2 of the first polypropylene (PP1) [MFR 2 (PC)/MFR 2 (PP1)] is in the range of 0.08 to 0.62, more preferably in the range of 0.10 to 0.50, yet more preferably in the range of 0.15 to 0.35.
  • first polypropylene (PP1) and/or the second polypropylene (PP2) comprise(s) apart from propylene also comonomers.
  • the mixture (M) and/or the polypropylene composition (PC) comprise(s) apart from propylene ethylene and/or C 4 to C 12 ⁇ -olefins.
  • mixture (M) and/or the polypropylene composition (PC) may comprise in addition to propylene monomers such as ethylene and/or C 4 to C 12 ⁇ -olefins, in particular ethylene and/or C 4 to C 8 ⁇ -olefins, e.g. ethylene, 1-butene and/or 1-hexene.
  • propylene monomers such as ethylene and/or C 4 to C 12 ⁇ -olefins, in particular ethylene and/or C 4 to C 8 ⁇ -olefins, e.g. ethylene, 1-butene and/or 1-hexene.
  • the mixture (M) and/or the polypropylene composition (PC) has/have a comonomer content, like an ethylene content, in the range of 0.1 to 6.0 wt.-%, more preferably in the range of 0.5 to 5.0 wt.-%, yet more preferably in the range of 1.0 to 4.5 wt.-%.
  • the mixture (M) and/or the polypropylene composition (PC) has/have preferably a rather high melting temperature Tm. Accordingly, it is preferred that the mixture (M) and/or the polypropylene composition (PC) has/have a melting temperature Tm of at least 120 °C, more preferably in the range of 120 to 155 °C, yet more in the range of 125 to 150 °C, still yet more preferably in the range of 130 to 147 °C.
  • the mixture (M) and/or the polypropylene composition (PC) has/have a xylene cold soluble (XCS) content in the range of 1.0 to 10.0 wt.-%, more preferably in the range 1.5 to 9.0 wt.-%, yet more preferably in the range of 2.0 to 8.0 wt.-%, like in the range of 2.3 to 7.0 wt.-%.
  • XCS xylene cold soluble
  • the polypropylene composition (PC) (and thus also the mixture (M)) can be produced in a sequential polymerization process wherein in a first step the first polypropylene (PP1) and in a second step the second polypropylene (PP2) is produced.
  • the second polypropylene (PP2) may be produced and subsequently in a second step the first polypropylene (PP1).
  • additives can be introduced by means of melt blending.
  • the first polypropylene (PP1) and the second polypropylene (PP2) will be now defined in more detail.
  • the first polypropylene (PP1) is the first polypropylene (PP1)
  • the mixture (M) comprises, preferably consists of, the first polypropylene (PP1) and the second polypropylene (PP2).
  • PP1 first polypropylene
  • PP2 second polypropylene
  • the first polypropylene (PP1) preferably has a comonomer content, like ethylene content, of at most 3.0 wt.-%, more preferably of in the range of 0.3 to 2.5 wt.-%, yet more preferably in the range of 0.5 to 2.2 wt.-%. Accordingly, the first polypropylene (PP1) can be a first propylene homopolymer (H-PP1) or a first random propylene copolymer (R-PP1), the latter being preferred.
  • propylene homopolymer used in the instant invention relates to a polypropylene that consists substantially, i.e. of more than 99.50 wt.-%, still more preferably of at least 99.70 wt.-%, of propylene units. In a preferred embodiment only propylene units in the propylene homopolymer are detectable.
  • the first polypropylene (PP1) is a first random propylene copolymer (R-PP1)
  • the first random propylene copolymer (R-PP1) comprises monomers co-polymerizable with propylene, for example co-monomers such as ethylene and/or C 4 to C 12 ⁇ -olefins, in particular ethylene and/or C 4 to C 8 ⁇ -olefins, e.g. 1-butene and/or 1-hexene.
  • the first random propylene copolymer (R-PP1) according to this invention comprises, especially consists of, monomers co-polymerizable with propylene from the group consisting of ethylene, 1-butene and 1-hexene.
  • the first random propylene copolymer (R-PP1) of this invention comprises - apart from propylene - units derivable from ethylene and/or 1-butene.
  • the first random propylene copolymer (R-PP1) comprises units derivable from ethylene and propylene only, i.e. is a first propylene ethylene copolymer (PEC1).
  • the first random propylene copolymer (R-PP1) preferably the first propylene ethylene copolymer (PEC1)
  • random indicates in the present invention that the co-monomers of the random propylene copolymers are randomly distributed within the propylene copolymer.
  • random is understood according to IUPAC ( Glossary of basic terms in polymer science; IUPAC recommendations 1996 ).
  • the first polypropylene (PP1) more preferably the first random propylene copolymer (R-PP1), like the first propylene ethylene copolymer (PEC1), has a weight average molecular weight Mw in the range of 35 to 75 kg/mol, preferably in the range of 38 to 70 kg/mol, still more preferably in the range of 40 to 65 kg/mol, like in the range of 43 to 60 kg/mol.
  • the first polypropylene (PP1) more preferably the first random propylene copolymer (R-PP1), like the first propylene ethylene copolymer (PEC1)
  • the melt flow rate (230 °C) measured according to ISO 1133 of the first polypropylene (PP1), more preferably of the first random propylene copolymer (R-PP1), like of the first propylene ethylene copolymer (PEC1) is preferably at least 1,000 g/10 min, more preferably in the range of 1,500 to 10,000 g/10min, more preferably in the range of 2000 to 8,000 g/10 min.
  • the first polypropylene (PP1) more preferably the first random propylene copolymer (R-PP1), like the first propylene ethylene copolymer (PEC1), has a molecular weight distribution (Mw/Mn) in the range of 2.0 to 8.0, more preferably in the range of 2.5 to 7.5, like in the range of 3.0 to 7.0.
  • Mw/Mn molecular weight distribution
  • the first polypropylene (PP1) more preferably the first random propylene copolymer (R-PP1), like the first propylene ethylene copolymer (PEC1), has a xylene cold soluble (XCS) fraction in the range of 1.0 to 5.0 wt.-%, more preferably in the range of 1.3 to 4.5 wt.-%, like in the range of 1.5 to 4.0 wt.-%.
  • XCS xylene cold soluble
  • the second polypropylene (PP2) is the second polypropylene (PP2)
  • the second polypropylene (PP2) preferably has a comonomer content, like ethylene content, in the range of 0.5 to 8.0 wt.-%, more preferably in the range of 1.0 to 7.0 wt.-%, yet more preferably in the range of 1.5 to 6.5 wt.-%. Accordingly, the second polypropylene (PP2) is a second random propylene copolymer (R-PP2).
  • the second polypropylene (PP2) being a second random propylene copolymer (R-PP2) comprises monomers co-polymerizable with propylene, for example co-monomers such as ethylene and/or C 4 to C 12 ⁇ -olefins, in particular ethylene and/or C 4 to C 8 ⁇ -olefins, e.g. 1-butene and/or 1-hexene.
  • the second random propylene copolymer (R-PP2) according to this invention comprises, especially consists of, monomers co-polymerizable with propylene from the group consisting of ethylene, 1-butene and 1-hexene.
  • the second random propylene copolymer (R-PP2) of this invention comprises - apart from propylene - units derivable from ethylene and/or 1-butene.
  • the second random propylene copolymer (R-PP2) comprises units derivable from ethylene and propylene only, i.e. is a second propylene ethylene copolymer (PEC2).
  • the second random propylene copolymer (R-PP2) like the second propylene ethylene copolymer (PEC2), has preferably a co-monomer content, like an ethylene content, in the range of 0.5 to 8.0 wt.-%, more preferably in the range of 1.0 to 7.0 wt.-%, yet more preferably in the range of 1.5 to 6.5 wt.-%.
  • the weight average molecular weight Mw of second polypropylene (PP2) being a second random propylene copolymer (R-PP2) is higher than the weight average molecular weight Mw of the first polypropylene (PP1), like the first random propylene copolymer (R-PP1), e.g. the first propylene ethylene copolymer (PEC1). Accordingly, it is preferred that the weight average molecular weight Mw of the second polypropylene (PP2) being a second random propylene copolymer (R-PP2) is in the range of more than 90 to 250 kg/mol, more preferably in the range of 95 to 200 kg/mol, like in the range of 100 to 180 kg/mol.
  • the second polypropylene (PP2) being a second random propylene copolymer (R-PP2) has a melt flow rate MFR 2 (230 °C) measured according to ISO 1133 in the range of more than 50 to 650 g/10min, more preferably in the range of 80 to 600 g/10min, more preferably in the range of 100 to 550 g/10min, like in the range of 110 to 500 g/10min.
  • the second polypropylene (PP2) being a second random propylene copolymer (R-PP2) has a molecular weight distribution (Mw/Mn) in the range of 2.0 to 8.0, more preferably in the range of 2.3 to 7.5, like in the range of 2.5 to 7.0.
  • the second polypropylene (PP2) being a second random propylene copolymer (R-PP2) has a xylene cold soluble (XCS) fraction in the range of 1.5 to 12.0 wt.-%, more preferably in the range of 1.8 to 10.0 wt.-%, like in the range of 2.0 to 9.0 wt.-%.
  • XCS xylene cold soluble
  • the polypropylene composition (PC) and/or the mixture (M) is preferably produced in a multistage process comprising at least two reactors connected in series.
  • polypropylene composition (PC) and/or the mixture (M) is obtained by a sequential polymerization process comprising the steps of
  • the term “sequential polymerization process” indicates that the polypropylene composition (PC) and/or the mixture (M) is produced in at least two, like three, reactors connected in series. Accordingly, the present process comprises at least a first reactor, a second reactor, and optionally a third reactor.
  • the term “polymerization process” shall indicate that the main polymerization takes place. Thus in case the process consists of three polymerization reactors, this definition does not exclude the option that the overall process comprises for instance a pre-polymerization step in a pre-polymerization reactor.
  • the term “consist of” is only a closing formulation in view of the main polymerization process.
  • the first reactor is preferably a slurry reactor and can be any continuous or simple stirred batch tank reactor or loop reactor operating in bulk or slurry.
  • Bulk means a polymerization in a reaction medium that comprises of at least 60 % (w/w) monomer.
  • the slurry reactor is preferably a (bulk) loop reactor.
  • the second reactor is preferably a gas phase reactor.
  • gas phase reactors can be any mechanically mixed or fluid bed reactors.
  • the gas phase reactors comprise a mechanically agitated fluid bed reactor with gas velocities of at least 0.2 m/sec.
  • the gas phase reactor is a fluidized bed type reactor preferably with a mechanical stirrer.
  • the first reactor is a slurry reactor, like loop reactor
  • the second reactor is a gas phase reactor (GPR).
  • GPR gas phase reactor
  • a preferred multistage process is a "loop-gas phase"-process, such as developed by Borealis A/S, Denmark (known as BORSTAR® technology) described e.g. in patent literature, such as in EP 0 887 379 , WO 92/12182 WO 2004/000899 , WO 2004/111095 , WO 99/24478 , WO 99/24479 or in WO 00/68315 .
  • a further suitable slurry-gas phase process is the Spheripol ® process of Basell.
  • the conditions for the first reactor i.e. the slurry reactor, like a loop reactor, may be as follows:
  • reaction mixture of the first reactor is transferred to the second reactor, i.e. gas phase reactor, where the conditions are preferably as follows:
  • the residence time can vary in the three reactor zones.
  • the residence time in bulk reactor e.g. loop is in the range 0.1 to 2.5 hours, e.g. 0.15 to 1.5 hours and the residence time in gas phase reactor will generally be 0.2 to 6.0 hours, like 0.5 to 4.0 hours.
  • the polymerization may be effected in a known manner under supercritical conditions in the first reactor, i.e. in the slurry reactor, like in the loop reactor, and/or as a condensed mode in the gas phase reactors.
  • the propylene copolymer (PP) of the instant invention is preferably produced in the presence of a single-site catalyst, in particular in the presence of a metallocene catalyst, said metallocene catalyst system comprises
  • the solid single site catalyst system has a porosity measured according ASTM 4641 of less than 1.40 ml/g and/or a surface area measured according to ASTM D 3663 of lower than 25 m 2 /g.
  • the solid catalyst system (SCS) has a surface area of lower than 15 m 2 /g, yet still lower than 10 m 2 /g and most preferred lower than 5 m 2 /g, which is the lowest measurement limit.
  • the surface area according to this invention is measured according to ASTM D 3663 (N 2 ).
  • the solid single site catalyst system has a porosity of less than 1.30 ml/g and more preferably less than 1.00 ml/g.
  • the porosity has been measured according to ASTM 4641 (N 2 ).
  • the porosity is not detectable when determined with the method applied according to ASTM 4641 (N2).
  • the solid single site catalyst system typically has a mean particle size of not more than 500 ⁇ m, i.e. preferably in the range of 2 to 500 ⁇ m, more preferably 5 to 200 ⁇ m. It is in particular preferred that the mean particle size is below 80 ⁇ m, still more preferably below 70 ⁇ m. A preferred range for the mean particle size is 5 to 70 ⁇ m, or even 10 to 60 ⁇ m.
  • transition metal (M) is zirconium (Zr) or hafnium (Hf), preferably zirconium (Zr).
  • ⁇ -ligand is understood in the whole description in a known manner, i.e. a group bound to the metal via a sigma bond.
  • anionic ligands "X" can independently be halogen or be selected from the group consisting of R', OR', SiR' 3 , OSiR' 3 , OSO 2 CF 3 , OCOR', SR', NR' 2 or PR' 2 group wherein R' is independently hydrogen, a linear or branched, cyclic or acyclic, C 1 -C 20 -alkyl, C 2 -C 20 -alkenyl, C 2 -C 20 -alkynyl, C 3 -C 12 -cycloalkyl, C 6 -C 20 -aryl, C 7 -C 20 -arylalkyl, C 7 -C 20 -alkylaryl, C 8 -C 20 -arylalkenyl, in which the R' group can optionally contain one or more
  • a preferred monovalent anionic ligand is halogen, in particular chlorine (Cl).
  • the substituted cyclopentadienyl-type ligand(s) may have one or more substituent(s) being selected from the group consisting of halogen, hydrocarbyl (e.g.
  • the two substituents R" can form a ring, e.g. five-or six-membered ring, together with the nitrogen atom where they are attached to.
  • R of formula (I) is preferably a bridge of 1 to 4 atoms, such atoms being independently carbon (C), silicon (Si), germanium (Ge) or oxygen (O) atom(s), whereby each of the bridge atoms may bear independently substituents, such as C 1 -C 20 -hyo-hydrocarbyl, tri(C 1 -C 20 -alkyl)silyl, tri(C 1 -C 20 -alkyl)siloxy and more preferably "R” is a one atom bridge like e.g.
  • each R'" is independently C 1 -C 20 -alkyl, C 2 -C 20 -alkenyl, C 2 -C 20 -alkynyl, C 3 -C 12 -cycloalkyl, C 6 -C 20 -aryl, alkylaryl or arylalkyl, or tri(C 1 -C 20 -alkyl)silyl-residue, such as trimethylsilyl-, or the two R"' can be part of a ring system including the Si bridging atom.
  • the transition metal compound has the formula (II) wherein
  • the transition metal compound of formula (II) is C 2 -symmetric or pseudo-C 2 -symmetric. Concerning the definition of symmetry it is referred to Resconi et al. Chemical Reviews, 2000, Vol. 100, No. 4 1263 and references cited therein.
  • the residues R 1 are equal to or different from each other, more preferably equal, and are selected from the group consisting of linear saturated C 1 -C 10 -alkyl, linear unsaturated C 1 -C 10 -alkyl, branched saturated C 1 -C 10 -alkyl, branched unsaturated C 1 -C 10 -alkyl and C 7 -C 12 -arylalkyl.
  • the residues R 1 are equal to or different from each other, more preferably equal, and are selected from the group consisting of linear saturated C 1 -C 6 -alkyl, linear unsaturated C 1 -C 6 -alkyl, branched saturated C 1 -C 6 -alkyl, branched unsaturated C 1 -C 6 -alkyl and C 7 -C 10 -arylalkyl. Yet more preferably the residues R 1 are equal to or different from each other, more preferably equal, and are selected from the group consisting of linear or branched C 1 -C 4 -hydrocarbyl, such as for example methyl or ethyl.
  • residues R 2 to R 6 are equal to or different from each other and linear saturated C 1 -C 4 -alkyl or branched saturated C 1 -C 4 -alkyl. Even more preferably the residues R 2 to R 6 are equal to or different from each other, more preferably equal, and are selected from the group consisting of methyl, ethyl, iso-propyl and tert-butyl.
  • R 7 and R 8 are equal to or different from each other and are selected from hydrogen and methyl, or they are part of a 5-carbon ring including the two indenyl ring carbons to which they are attached.
  • R 7 is selected from OCH 3 and OC 2 H 5
  • R 8 is tert-butyl.
  • the transition metal compound is rac-methyl(cyclohexyl)silanediyl bis(2-methyl-4-(4-tert-butylphenyl)indenyl)zirconium dichloride.
  • the transition metal compound is rac-dimethylsilanediyl bis(2-methyl-4-phenyl-1,5,6,7-tetrahydro-s-indacen-1-yl)zirconium dichloride.
  • the transition metal compound is rac-dimethylsilanediyl bis(2-methyl-4-phenyl-5-methoxy-6-tert-butylindenyl)zirconium dichloride.
  • the solid single site catalyst system according to this invention may comprise a cocatalyst (Co) comprising an element (E) of group 13 of the periodic table (IUPAC), for instance the cocatalyst (Co) comprises a compound of Al.
  • cocatalyst (Co) are organo aluminium compounds, such as aluminoxane compounds.
  • Such compounds of Al preferably aluminoxanes, can be used as the only compound in the cocatalyst (Co) or together with other cocatalyst compound(s).
  • other cation complex forming cocatalyst compounds like boron compounds can be used.
  • Said cocatalysts are commercially available or can be prepared according to the prior art literature. Preferably however in the manufacture of the solid catalyst system only compounds of Al as cocatalyst (Co) are employed.
  • cocatalysts are the aluminoxanes, in particular the C 1 to C 10 -alkylaluminoxanes, most particularly methylaluminoxane (MAO).
  • the organo-zirconium compound of formula (I) and the cocatalyst (Co) of the solid single site catalyst system represent at least 70 wt%, more preferably at least 80 wt%, even more preferably at least 90 wt%, even further preferably at least 95 wt% of the solid catalyst system.
  • the solid single site catalyst system is featured by the fact that it is self-supported, i.e. it does not comprise any catalytically inert support material, like for instance silica, alumina or MgCl 2 , which is otherwise commonly used in heterogeneous catalyst systems, i.e. the catalyst is not supported on external support or carrier material.
  • the solid single site catalyst system is self-supported and it has a rather low surface area.
  • the solid single site catalyst system is obtained by the emulsion/solidification technology, the basic principles of which are described in WO 03/051934 . This document is herewith included in its entirety by reference.
  • the solid single site catalyst system is preferably in the form of solid catalyst particles, obtainable by a process comprising the steps of
  • a first solvent more preferably a first organic solvent, is used to form said solution.
  • the organic solvent is selected from the group consisting of a linear alkane, cyclic alkane, aromatic hydrocarbon and halogen-containing hydrocarbon.
  • the second solvent forming the continuous phase is an inert solvent towards to catalyst components.
  • the second solvent might be immiscible towards the solution of the catalyst components at least under the conditions (like temperature) during the dispersing step.
  • the term "immiscible with the catalyst solution” means that the second solvent (continuous phase) is fully immiscible or partly immiscible i.e. not fully miscible with the dispersed phase solution.
  • the immiscible solvent comprises a fluorinated organic solvent and/or a functionalized derivative thereof, still more preferably the immiscible solvent comprises a semi-, highly- or perfluorinated hydrocarbon and/or a functionalized derivative thereof.
  • said immiscible solvent comprises a perfluorohydrocarbon or a functionalized derivative thereof, preferably C 3 -C 30 -perfluoroalkanes, -alkenes or - cycloalkanes, more preferred C 4 -C 10 -perfluoro-alkanes, -alkenes or -cycloalkanes, particularly preferred perfluorohexane, perfluoroheptane, perfluorooctane or perfluoro (methylcyclohexane) or perfluoro (1,3- dimethylcyclohexane) or a mixture thereof.
  • a perfluorohydrocarbon or a functionalized derivative thereof preferably C 3 -C 30 -perfluoroalkanes, -alkenes or - cycloalkanes, more preferred C 4 -C 10 -perfluoro-alkanes, -alkenes or -cycloalkanes,
  • the emulsion comprising said continuous phase and said dispersed phase is a bi-or multiphasic system as known in the art.
  • An emulsifier may be used for forming and stabilising the emulsion. After the formation of the emulsion system, said catalyst is formed in situ from catalyst components in said solution.
  • the emulsifying agent may be any suitable agent which contributes to the formation and/or stabilization of the emulsion and which does not have any adverse effect on the catalytic activity of the catalyst.
  • the emulsifying agent may e.g. be a surfactant based on hydrocarbons optionally interrupted with (a) heteroatom(s), preferably halogenated hydrocarbons optionally having a functional group, preferably semi-, highly- or perfluorinated hydrocarbons as known in the art.
  • the emulsifying agent may be prepared during the emulsion preparation, e.g. by reacting a surfactant precursor with a compound of the catalyst solution.
  • Said surfactant precursor may be a halogenated hydrocarbon with at least one functional group, e.g. a highly fluorinated C 1 -C n (suitably C 4 -C 30 or C 5 -C 15 ) alcohol (e.g. highly fluorinated heptanol, octanol or nonanol), oxide (e.g. propenoxide) or acrylate ester which reacts e.g. with a cocatalyst component, such as aluminoxane to form the "actual" surfactant.
  • a highly fluorinated C 1 -C n suitable C 4 -C 30 or C 5 -C 15
  • alcohol e.g. highly fluorinated heptanol, octanol or nonanol
  • oxide e.g. propenoxide
  • acrylate ester which reacts e.g. with a cocatalyst component, such as aluminoxan
  • any solidification method can be used for forming the solid particles from the dispersed droplets.
  • the solidification is effected by a temperature change treatment.
  • the emulsion subjected to gradual temperature change of up to 10°C/min, preferably 0.5 to 6°C/min and more preferably 1 to 5°C/min.
  • the emulsion is subjected to a temperature change of more than 40°C, preferably more than 50°C within less than 10 seconds, preferably less than 6 seconds.
  • the polypropylene composition (PC) may include additives (AD).
  • Typical additives are nucleating agents acid scavengers, antioxidants, colorants, light stabilisers, plasticizers, slip agents, anti-scratch agents, dispersing agents, processing aids, lubricants, pigments, and the like.
  • additives (AD) also includes carrier materials, in particular polymeric carrier materials (PCM).
  • PCM polymeric carrier materials
  • PCM Polymeric Carrier Material
  • the polypropylene composition (PC) of the invention does not comprise (a) further polymer (s) different to the mixture (M), i.e. different to the first polypropylene (PP1) and the second polypropylene (PP2), in an amount exceeding 10 wt.-%, preferably in an amount exceeding 5 wt.-%, more preferably in an amount exceeding 3 wt.-%, based on the weight of the polypropylene composition (PC).
  • a polymer is typically a polymeric carrier material (PCM) for additives (AD). Any carrier material for additives (AD) is not calculated to the amount of polymeric compounds as indicated in the present invention, but to the amount of the respective additive.
  • the polymeric carrier material (PCM) is a carrier polymer for the other additives (AD) to ensure a uniform distribution in the composition of the invention.
  • the polymeric carrier material (PCM) is not limited to a particular polymer.
  • the polymeric carrier material (PCM) may be ethylene homopolymer, ethylene copolymer obtained from ethylene and ⁇ -olefin comonomer such as C 3 to C 8 ⁇ -olefin comonomer, propylene homopolymer and/or propylene copolymer obtained from propylene and ⁇ -olefin comonomer such as ethylene and/or C 4 to C 8 ⁇ -olefin comonomer.
  • the melt blown web (MBW)
  • the present invention is not only directed to the melt blown fibers (MBFs) as such but also to articles, like webs, made thereof.
  • the present invention is directed to a melt blown web (MBW) comprising melt blown fibers (MBFs) of the instant invention.
  • the melt blown web (MBW) comprises, based on the total weight of the melt blown web (MBW), at least 80 wt.-%, more preferably at least 90 wt.-%, yet more preferably at least 95 wt.-%, like at least 99 wt.-%, of melt blown fibers (MBFs) as defined herein.
  • the melt blown web (MBW) consists of the melt blown fibers (MBFs) as defined herein.
  • the present invention is directed to articles comprising the melt blown fibers (MBFs) and/or the melt-blown web (MBW) of the present invention, like filtration medium (filter), diaper, sanitary napkin, panty liner, incontinence product for adults, protective clothing, surgical drape, surgical gown, and surgical wear, comprising the melt-blown fibers (MBFs) and/or the melt-blown web (MBW), preferably in an amount of at least 80.0 wt.-% of, more preferably in an amount of at least 95.0 wt.-%, based on the total weight of the article.
  • the article consists of the melt-blown fibers (MBFs) and/or the melt-blown web (MBW).
  • the invention is directed to articles selected from the group consisting of filtration medium (filter), diaper, sanitary napkin, panty liner, incontinence product for adults, protective clothing, surgical drape, surgical gown, and surgical wear, comprising a melt blown web (MBW) comprising, e.g. consisting of, the melt blown fibers (MBFs) of the present invention and a spunbonded fabric known in the art.
  • filter filtration medium
  • diaper sanitary napkin
  • panty liner incontinence product for adults
  • protective clothing e.g. consisting of, the melt blown fibers (MBFs) of the present invention
  • MMFs melt blown fibers
  • the weight per unit area of the melt-blown web depends very much on the end use, however it is preferred that the melt-blown web has a weight per unit area of at least 1 g/m 2 , more preferably in the range from 1 to 250 g/m 2 , still more preferably in the range from 3 to 220 g/m 2 , yet more preferably in the range from 6 to 200 g/m 2 , like in the range from 6 to 100 g/m 2 .
  • These values are especially applicable in case the melt-blown web (MBW) according to the instant invention is produced as a single layer web (e.g. for air filtration purposes).
  • melt-blown web (MBW) is produced as one part of a multi-layer construction like an SMS-web comprising, preferably consisting of, a spunbonded web layer, a melt-blown web (MBW) layer and another spunbonded web layer (e.g. for hygienic application)
  • the melt-blown web (MBW) has a weight per unit area of at least 1 g/m 2 , more preferably in the range of 1 to 30 g/m 2 , still more preferably in the range of 1.3 to 20 g/m 2 .
  • the multi-layer construction can also include a multiplicity of melt-blown web layers and spunbonded web layers, such as a SSMMS construction.
  • the instant polypropylene composition is preferably used in pellet or granule form for the preparation of the melt-blown fibers (MBFs) (and thus of the melt-blown web (MBW)).
  • metering pumps are used to pump the molten t polypropylene composition (PC) to a distribution system having a series of die tips, the polypropylene composition (PC) being in the molten state at some processing temperature.
  • the die tip is designed in such a way that the holes are in a straight line with high-velocity air impinging from each side.
  • a typical die will have 0.3 to 0.5 mm diameter, preferably 0.4 mm diameter, holes spaced at 10 to 16 per cm (25 to 40 per inch). The impinging high-velocity hot air attenuates the filaments and forms the desired fibers.
  • the processing temperature is one factor in the final web properties.
  • the "optimal" processing temperature is one at which ideal properties of the web are achieved such as low shot with good hand and high barrier properties, or good filtration properties.
  • melt-blown fibers MMFs
  • melt blown web MFW
  • Quantitative nuclear-magnetic resonance (NMR) spectroscopy was used to quantify the comonomer content of the polymers. Quantitative 13 C ⁇ 1 H ⁇ NMR spectra were recorded in the solution-state using a Bruker Advance III 400 NMR spectrometer operating at 400.15 and 100.62 MHz for 1 H and 13 C respectively. All spectra were recorded using a 13 C optimised 10 mm extended temperature probehead at 125°C using nitrogen gas for all pneumatics.
  • Integral regions were slightly adjusted to increase applicability across the whole range of encountered comonomer contents.
  • E 0.5 I H + I G + 0.5 I C + I D using the same notation used in the article of Wang et. al.
  • Equations used for absolute propylene content were not modified.
  • the comonomer sequence distribution at the triad level was determined using the analysis method of Kakugo et al. ( Kakugo, M., Naito, Y., Mizunuma, K., Miyatake, T.
  • MFR 2 (230°C / 2.16 kg) is measured according to ISO 1133 at 230°C and 2.16 kg load.
  • Zero shear viscosity ( ⁇ 0 ) Dynamic rheological measurements were carried out with Rheometrics RDA-II QC on compression molded samples under nitrogen atmosphere at 200°C using 25 mm -diameter plate and plate geometry. The oscillatory shear experiments were done within the linear viscoelastic range of strain at frequencies from 0.01 to 500 rad/s.
  • M n Number average molecular weight (M n ), weight average molecular weight (M w ) and molecular weight distribution (MWD)
  • Mw, Mn Molecular weight averages
  • Mw/Mn molecular weight distribution
  • a PolymerChar GPC instrument equipped with infrared (IR) detector was used with 3 x Olexis and lx Olexis Guard columns from Polymer Laboratories and 1 ,2,4-trichlorobenzene (TCB, stabilized with 250 mg/L 2,6-Di tert butyl-4-methyl-phenol) as solvent at 160 °C and at a constant flow rate of 1 mL/min. 200 of sample solution were injected per analysis.
  • the column set was calibrated using universal calibration (according to ISO 16014-2:2003) with at least 15 narrow MWD polystyrene (PS) standards in the range of 0,5 kg/mol to 11 500 kg/mol.
  • PS narrow MWD polystyrene
  • the crystallinity is calculated from the melting enthalpy by assuming an Hm-value of 209 J/g for a fully crystalline polypropylene (see Brandrup, J., Immergut, E. H., Eds. Polymer Handbook, 3rd ed. Wiley, New York, 1989; Chapter 3 ).
  • the glass transition temperature Tg is determined by dynamic mechanical analysis according to ISO 6721-7. The measurements are done in torsion mode on compression moulded samples (40x10x1 mm 3 ) between -100 °C and +150 °C with a heating rate of 2 °C/min and a frequency of 1 Hz.
  • the unit weight (grammage) of the webs in g/m 2 was determined in accordance with EN 29073-1 (1992) "Test methods for nonwovens - Determination of mass per unit area"
  • the number average fibre diameter was determined using scanning electron microscopy (SEM). A representative part of the web was selected and an SEM micrograph of suitable magnification was recorded, then the diameter of 20 fibres was measured and the number average calculated.
  • SEM scanning electron microscopy
  • the hydrohead or water resistance as determined by a hydrostatic pressure test is determined according to the WSP (wordwide strategic partners) standard test WSP 80.6 (09) as published in December 2009. This industry standard is in turn based on ISO 811:1981 and uses specimens of 100 cm 2 at 23°C with purified water as test liquid and a rate of increase of the water pressure of 10 cm/min.
  • the air permeability was determined in accordance with DIN ISO 9237.
  • Comparative example 4 used for MB web production likewise is the commercial product HL512FB of Borealis, based on a Ziegler-Natta type catalyst and visbreaking. It has an MFR (230°C / 2.16kg) of 1200 g/10 min, an Mw of 78 kg/mol, an MWD of 3.8 and a Tm of 158°C.
  • Table 2 Properties the melt blown web (MBW) at die-to-collector distance (DCD) of 200 mm (n.p. - spinning not possible) EX1 CE1 CE4 at melt temperature 250°C Fiber diameter [ ⁇ m] 1.1 1.4 1.2 Web weight [g/m 2 ] 9.6 9.1 8.9 Hydrohead [cm H 2 O] 75.2 40.9 68.7 Air permeability [mm/s] 762 1656 974 at melt temperature 270 °C Fiber diameter [ ⁇ m] 0.9 1.2 n.p.
EP16173184.9A 2016-06-06 2016-06-06 Schmelzgeblasene bahn mit guten wasserbarriereeigenschaften Active EP3255189B1 (de)

Priority Applications (7)

Application Number Priority Date Filing Date Title
EP16173184.9A EP3255189B1 (de) 2016-06-06 2016-06-06 Schmelzgeblasene bahn mit guten wasserbarriereeigenschaften
DK16173184.9T DK3255189T3 (en) 2016-06-06 2016-06-06 Meltblown tissue with good water barrier properties
CN201780032127.3A CN109312511B (zh) 2016-06-06 2017-06-02 具有良好防水性能的熔喷纤网
BR112018071865-3A BR112018071865B1 (pt) 2016-06-06 2017-06-02 Fibra e folha contínua por sopro em fusão, e, artigo
PCT/EP2017/063434 WO2017211709A1 (en) 2016-06-06 2017-06-02 Melt blown web with good water barrier properties
US16/302,071 US20190301054A1 (en) 2016-06-06 2017-06-02 Melt blown web with good water barrier properties
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WO2017211709A1 (en) 2017-12-14
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